Skip to Main content Skip to Navigation

Nanorhéologie et autres problèmes de polymères aux interfaces

Abstract : Molten thermoplastic polymers slip on smooth, non-adsorbing, solid surfaces: the fluid velocity is non-zero at the interface. Slippage is reduced if macromolecules are grafted on the surface. In this theoretical work, we modelize the slippage reduction through molecular mechanisms, i.e., on the nanometric scale. The microscopic behaviour of the molecules and the macroscopic rheological response of the interface are described. The predictions of this model and of other molecular models are compared with the experimental results obtained by a team in the laboratory. The observed behaviour is explained to some extent, but the explored range of the parameters does not allow for a choice between all the models. A different test is suggested, using star polymers. Other problems were studied: conformation of a single macromolecule in a chemically different melt, statics of a polymer brush and of a star in the same conditions, partial penetration of a melt inside a chemically identical, very dense brush, generalization of a separation method for diluted star polymers to the case of statistically branched polymers, determination of the gelation point for a structure made of ring polymers ("Olympic gel"), spreading dynamics of a superfluid helium droplet which is similar to that of a droplet of liquid polymer. Présentation (PDF p. 6, English p. 8) Partie I. Statique et dynamique de polymères liquides (PDF p. 10) Chapitre 1. Généralités sur les polymères (PDF p. 11, English p. 12, français p. 16) Chapitre 2. Polymères fondus : propriétés et mise en oeuvre (PDF p. 39, English p. 40, français p. 42) Chapitre 3. Polymères fondus : éléments de théorie (PDF p. 58, English p. 59, français p. 66) Partie II. Statique et dynamique de chaînes greffées (PDF p. 153) Chapitre 4. Statique de chaînes greffées (PDF p. 154, English p. 155, français p. 158) Chapitre 5. Glissement d'un polymère fondu sur une surface greffée (PDF p. 200, English p. 201, français p. 223) Partie III. Autres problèmes (PDF p. 313) Chapitre 6. Caractérisation de polymères branchés par perméation (PDF p. 314, français p. 315, article in English p. 318) Chapitre 7. Gel olympique (PDF p. 332, English p. 333, français p. 338) Chapitre 8. Étalement d'une goutte par effet Josephson (PDF p. 358, français p. 359, article in English p. 361) Conclusion (PDF français p. 370, English p. 372) Bibliographie (PDF p. 374) Table des matières / Table of contents (PDF p. 380)
Complete list of metadata
Contributor : Cyprien Gay Connect in order to contact the contributor
Submitted on : Friday, December 20, 2013 - 10:41:04 PM
Last modification on : Thursday, March 4, 2021 - 5:54:21 PM
Long-term archiving on: : Friday, March 21, 2014 - 9:40:12 AM